Presentation on theme: "Section 2: Scientific Methods"— Presentation transcript:
1 Section 2: Scientific Methods Scientists use scientific methods to systematically pose and test solutions to questions and assess the results of the tests.KWhat I KnowWWhat I Want to Find OutLWhat I Learned
11 2) Hypothesis - “Educated Guess” predict what will happen Based on prior knowledge11
12 3) Experiment - Test your hypothesis a) Control Group – stays the same, used for comparisonb) Variable Group – what youmanipulate that changes12
13 1. Independent Variable – what the experimenter (I) changes. 2. Dependent Variable – what is observed/measured.The dependent variable depends on the independent variableThe independent variable is what I change!!!13
14 If you were trying to determine if temperature affects bacterial growth, you would expose different petri dishes of the same bacteria to different temperatures.Temperature is your independent variable.Bacteria growth is your dependent variable.
15 3. Control Variables – all other variables that are kept constant. Remember, a good experiment only has two variables that change (independent and dependent). All the rest of the variables must be the same.15
16 During clinical drug trials, physicians will use a double-blind study During clinical drug trials, physicians will use a double-blind study. They use two statistically identical groups of patients. One will receive the drug and one will receive a placebo. Neither patient or physician will know which group receives the drug.The group receiving the placebo is the control group.